Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1997-07-09
1998-09-29
Hofsass, Jeffery A.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340438, 340441, 362 61, B60Q 100
Patent
active
058150722
ABSTRACT:
A vehicle display device such as a speed meter including indicators, many segments illuminated in two or more colors by plural LEDs and an indicator control circuit. The indicators dispose the segments so as to display a variable such as a car speed in a bar graph or in the form of a number. The indicator control circuit displays the variable by controlling the lighting of the LEDs and changes an emitted light color of indication based on a fixed color changing reference value in accordance with a value of the variable. The control circuit controls a duty ratio of a supply current or a current value in a predetermined set value range determined on the basis of the color changing reference value. Namely, brightness of the emitted light color before a color change is gradually decreased, while brightness of the emitted light color after the color change is gradually increased.
REFERENCES:
patent: 5583484 (1996-12-01), Asano
Noda Kazushi
Sano Yoshio
Sugihara Hiroshi
Tamaki Makoto
Tanabe Tetsuo
Hofsass Jeffery A.
Pope Daryl C.
Toyoda Gosei Co,., Ltd.
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